Acid catalyzed intramolecular photochemical reactions of 3-alkenyloxyphenols
作者:Norbert Hoffmann、Jean-Pierre Pete
DOI:10.1016/0040-4039(96)00190-6
日期:1996.3
Irradiation of 3-alkenyloxyphenols in a methanolic solution yields benzocyclobutenes. The efficiency increases if the reaction is carried out in the presence of acid. Formation of meta-alkylated phenols involving similar intramolecular [2+2] photocycloaddition intermediates is also observed when the olefinic double bond is substituted at the terminal position.
Oligomers as Intermediates in Ring-Closing Metathesis
作者:Jay C. Conrad、Melanie D. Eelman、João A. Duarte Silva、Sebastien Monfette、Henrietta H. Parnas、Jennifer L. Snelgrove、Deryn E. Fogg
DOI:10.1021/ja067531t
日期:2007.2.1
Oligomerization is kinetically favored in RCM reactions catalyzed by RuCl2(PCy3)(IMes)(=CHPh), for a range of unhindered , alpha,omega-dienes leading to large or medium-sized rings, even at dilutions designed to minimize intermolecular reaction. Reversible metathesis (i.e., ethenolysis) is inhibited by rapid volatilization of ethylene. At appropriately high dilutions, however, the RCM products are efficiently liberated by backbiting.
Intramolecular Photochemical Reactions of Bichromophoric 3-(Alkenyloxy)phenols and 1-(Alkenyloxy)-3-(alkyloxy)benzene Derivatives. Acid-Catalyzed Transformations of the Primary Cycloadducts
作者:Norbert Hoffmann、Jean-Pierre Pete
DOI:10.1021/jo970554t
日期:1997.10.1
Irradiation of 3-(alkenyloxy)phenols and 1-(alkenyloxy)-3-(alkyloxy)benzene derivatives, at lambda = 254 nm in acidic media, yields benzocyclobutenes, 3-alkylphenols, 3-alkylanisols, and 4-alkyl-1,2-dialkyloxybenzenes depending on the substitution pattern of the aromatic ring and the olefinic side chain. The final products are derived from an intramolecular [2 + 2] photocycloaddition and acidic rearrangements from a common intermediate.